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Electroplating wastewater recycling method and equipment

A technology for electroplating wastewater and wastewater, which is applied in metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of increased salt concentration in the plating tank and affect the normal electroplating working conditions of the closed circuit, and achieve the treatment cost Low, easy to control, process stable effect

Inactive Publication Date: 2015-12-16
CHANGZHOU UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

However, during the waste water reuse cycle of this method, the salt concentration in the plating tank increases continuously, which affects the normal electroplating working conditions in the closed cycle

Method used

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  • Electroplating wastewater recycling method and equipment
  • Electroplating wastewater recycling method and equipment
  • Electroplating wastewater recycling method and equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add precipitant sodium hydroxide to the pH adjustment tank of copper-containing wastewater, adjust the pH range to 8, and obtain treated copper-containing wastewater after precipitation treatment; introduce the treated copper-containing wastewater into the inclined tube sedimentation tank for preliminary solidification, Liquid separation to obtain solid phase and liquid phase; the solid phase is recovered after being filtered by a chamber filter press; the liquid phase is filtered through a filter, and then treated with an ion exchange column with hydrochloric acid and sodium hydroxide as the exchanger to obtain regeneration liquid and purified water ; The regeneration liquid is returned to the pH adjustment tank for recycling, and the purified water is treated by a reverse osmosis machine with a reverse osmosis membrane to obtain concentrated water and RO clear water; the concentrated water is evaporated by a thin-film evaporator, and the solid obtained after evaporation...

Embodiment 2

[0042] Introduce copper-containing wastewater, chromium-containing wastewater, cyanide-containing wastewater, nickel-containing wastewater, and pre-treatment wastewater into the pH adjustment pool respectively; add precipitant sodium hydroxide to the copper-containing wastewater pH adjustment pool, and adjust the pH range to 8.5;

[0043] Add precipitant ferrous sulfate in the chromium-containing wastewater pH adjustment tank to adjust the pH value to 8.5;

[0044] Add the precipitating agent sodium hypochlorite in the cyanogen-containing wastewater pH adjustment tank, and adjust the pH value to 11;

[0045] Add precipitating agent sodium carbonate in nickel-containing wastewater pH adjustment tank, and adjust the pH value to 5;

[0046] Adjust the pH range to 9 in the pretreatment wastewater pH adjustment tank.

[0047] After the precipitation treatment, the treated copper-containing wastewater, chromium-containing wastewater, cyanide-containing wastewater, nickel-containing...

Embodiment 3

[0052] Introduce copper-containing wastewater, chromium-containing wastewater, cyanide-containing wastewater, nickel-containing wastewater, and pre-treatment wastewater into the pH adjustment tank respectively; add precipitant sodium hydroxide to the pH adjustment tank of copper-containing wastewater, and adjust the pH range to 8;

[0053] Add precipitant sodium metabisulfite to the chromium-containing wastewater pH adjustment tank to adjust the pH value to 7;

[0054] Add the precipitating agent sodium hypochlorite in the cyanogen-containing wastewater pH adjustment tank, and adjust the pH value to 11;

[0055] Add precipitant sodium carbonate to the nickel-containing wastewater pH adjustment tank to adjust the pH value to 4.5;

[0056] Adjust the pH range to 6 in the pretreatment wastewater pH adjustment tank.

[0057] After the precipitation treatment, the treated copper-containing wastewater, chromium-containing wastewater, cyanide-containing wastewater, nickel-containing...

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Abstract

The invention provides an electroplating wastewater recycling method and equipment. The method comprises the following steps that electroplating wastewater is divided into copper containing wastewater, chromium containing wastewater, cyanogens containing wastewater, nickel containing wastewater and pretreatment wastewater; precipitating agents are added into respective pH regulating pools of the copper containing wastewater, the chromium containing wastewater and the cyanogens containing wastewater for regulating the pH value, and then the wastewater is treated respectively through an inclined pipe sedimentation pool, an ion exchange column, a chamber type filter press, a reverse osmosis machine and an evaporator; the pretreatment wastewater is subjected to filtering treatment by a filter and is then treated through the reverse osmosis machine; precipitating agents are added into a pH regulating pool of the nickel containing wastewater for regulating the pH value, and the wastewater is subjected to filtering treatment and is then subjected to ion exchange treatment; regenerated liquid generated in the treatment process returns to the pH regulating pool for cyclic treatment, and meanwhile, RO clean water and solid phase metal are recovered. The electroplating wastewater recycling method is used for electroplating wastewater treatment; the process is stable; the operation is simple and convenient; the control is easy; safety and reliability are realized; the treatment cost is lower.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method and equipment for recycling electroplating wastewater. Background technique [0002] Electroplating products are indispensable and irreplaceable in people's daily life and in various industrial sectors. At home and abroad, electroplating production has always been a "big water user" and "a big user who discharges wastewater that seriously pollutes the natural environment". At present, the domestic electroplating industry generally adopts the chemical treatment method to control the pollution of electroplating wastewater. Although this method can reach the discharge standard, there is a problem of high operating costs. More importantly, this method cannot reduce the electroplating material solution. consumption and wastewater discharge. Therefore, in order to carry out cleaner production in the electroplating industry, the technological process must be refo...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16
Inventor 张晟邵敏涂保华万玉山
Owner CHANGZHOU UNIV
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